wait 20 years and lung cancer will skyrocket. Mark my words, nothing but clean air should go into your lungs!
Even professional bakers develop lung issues from inhaling the flour.
That also goes for fungal mycotoxins found on marijuana leaves. Aspergillus, Penicillium, Fusarium, and Mucor all produce cancer causing mycotoxins to some degree. But hey, never stop a pothead wanting to get stoned.